America - Longbowman + Krepost

America's +1 sight will mean Longbowman can shoot targets without needing a unit to move close to their target. With the Krepost you can buy dirt cheap tiles.

Arabia - Panzer + Kasbah

Arabia can now use their large supply of oil to build a lot of Panzers. The Kasbah will be useful with their desert start bias.

Assyria - Battering Ram + War Elephant

Two strong early game units allow Assyria to make some early conquests, and gain some techs while they’re at it.

Austria - Nau + Satrap's Court

The Satrap’s Court provides gold to buy city states and the happiness to support the new cities in the empire. The Nau can get you that bit of extra gold needed to annex the city.

Aztecs - Mud Pyramid Mosque + Wat

Enjoy 5 extra culture per city along with the culture you get from killing units.

Babylon - Zero + Pyramid

Babylon will have unreachable science right from the ancient era. This tech boost will help them reach their late game unit before anyone else.

Brazil - Brazil Woodcamp + Ceilidh Hall

The opera house will be a building that you will want anyway when playing Brazil. Now it will generate more golden age points than the Pracinha ever did.

Byzantium - Pictish Warrior + Stele

That third religious belief will be a lot more reachable and effective now Byzantium has two of the best uniques for generating early game faith.

Carthage - Hakapeliitta + Keshik

Keshik conquests will spawn Great Generals much quicker that will then let the Keshiks go through mountains. The Hakapeliitta can help the Generals get to the warzone much faster. If you have a coastal city the civ you just conquered had a coastal city and roads connected to it you will instantly city connections with all of your conquered lands.

Celts - Mohawk Warrior + Candi

The Mohawk Warrior can help the Celts fight in the Forest that they started in. The Candi allows you to keep your good faith generation if you decide to chop down the forest.

China - Khan + Carolean

Melee units that heal 25 HP a turn and get China’s +30% great general bonus.

Denmark - Ballista + Feitora

With Denmark’s ability to move from ocean to land, the Ballista can get into range of the city, set up and fire all in one turn. That extra movement will also be helpful for moving workers to the city states where you can build Feitoras to keep the newly conquered cities happy.

Egypt - Bowman + Tercio

Egypt likes to focus on wonders. Now they can do so more effectively with two defensive unique units.

England - Ship of the Line + Sea Beggar

Weaken the enemy’s units with the Ship of the Line, then steal some of their ships. While the Sea Beggar’s healing up thanks to Supply, you can weaken their city with your massive navy. Once the Sea Beggar is back to good health, plough it into the city for a big cash injection.

Ethiopia - Hwach'a + Walls of Babylon

A strong defensive unit and the best defensive building in the game to help Ethiopia defend themselves.

France – Chateau + Mughal Fort

2 tourism in every city to help you reach a culture victory.

Germany - Maori Warrior + Atlatlist

Two early game units so you can immediately get to farming barbarians.

Greece - War Chariot + Hoplite

Great for Classical Era wars and getting tributes off of city states.

Huns - Companion Cavalry + Ducal Stable

Pastures give +1 gold and +1 production. That can be used to build a large army of highly experienced Companion Cavalry.

Inca - Legion + Cataphract

The legions can build maintenance-free roads on every hill in sight. The Cataphract is much more usable now that it can walk over hills for 1 movement point. Partner the two units for some early game conquests.

India - Naresuan's Elephant + Paper Maker

The paper maker will help India get buy happiness during the early game where their happiness is lower than normal. The Naresuan’s Elephant provides a defensive unit to keep out people who want high population cities.

Indonesia - Conquistador + Moai

Conquistadors mean Indonesia will be able to found cities and get their luxuries as soon as a decent bit of land is found. Since Indonesia’s colonies will likely be coastal, the Moai should be of good use.

Iroquois - Jaguar + Janissary

Upgrade Jaguars into Janissaries and you get vampire units that heal 75 health a turn. Woodsman is a nice promotion for the Iroquois’ forest start bias.

Japan - Chu-Ko-Nu + Musketeer

Once you hit the medieval era you will have Musketeers that constantly fight as 28 health units. They will be backed up by Chu-Ko-Nus who can shoot two full strength shots regardless of how much damage they have taken.

Korea - Terrace Farm + Floating Gardens

Korea can now work every single specialist slot in their cities thanks to the massive population they will have.

Mayans - Minutemen + Norwegian Sky Infantry

Minutemen ignore terrain costs. Upgrade them to Ski Infantry and they can move over four mountains per turn. The Maya’s ability lets them get a scientist to reach Rifling faster and they can get a Great General to fight in the medieval/renaissance wars.

Mongolia - African Forest Elephant + Comanche Rider

Mongolia’s ability brings the Elephant's to four movement a turn, making them much more effective. The Comanche Rider is now a six-movement unit.

Morocco - Bazaar + Polder

The ultimate money printing civ. +3 food, +1 production and +2 gold on all flood plains and + 2 gold on oasis tiles will make Morocco thrive in the desert.

Netherlands - Immortal + Impi

Upgrade the Immortals into Impis to get Impis that heal 20 HP a turn. The Netherlands can also trade for more luxuries/gold to support the early wars.

Ottomans - Turtle Ship + Great Galleass

The dominant naval civ before England tech up. The Turtle Ships will have the Prize Ships promotion that could steal more units that will have a cheap maintenance cost.

Persia - Mandekalu Cavalry + Camel Archer

In a golden age, Camel Archers will be just as fast as Keshiks with more strength. Once they have done the damage, the Mandelaku Cavalry can swoop in and take the opponent’s cities.

Poland - Berserker + Ikanda

Longswordsmen that run as fast as horses, have Amphibious and start with Zulu promotions which you unlock at Metal Casting. The extra social policies can also get you Landsknechts that will have three movement who can charge into cities from a safe tile to get twice as much gold.

Polynesia - Pathfinder + Samurai

This one is for all the people who play archipelago maps and like to steal the ruins before anyone has optics. The Samurai will help build boats around the coastal empire.

Portugal - Quinquereme + Dromon

The Ancient Era version of England/Ottomans. Portugal’s ability is twice as effective with cargo ships so having lots of coastal cities is a good strategy anyway, now they can buy an early game navy with that money.

Rome - Cossack + Hanse

The production powerhouse civ. The production gained from the city-state trade routes will let Rome produce a strong Cossack army.

Russia - B17 + Hussar

Russia will be able to build a large army of Hussars which will make their flanking bonus more effective. A death stack of B17s will make Russia tough to defeat in the late game.

Shoshone - Berber Cavalry + Mehal Safari

Very strong defensive units combined with +15% combat bonus in their lands will make the Shoshone tough to invade.

Siam - Sipahi + Burial Tomb

Siam can focus on non-mercantile city-states now that the Burial Tomb will cover happiness issues. The Sipahi can quickly pillage enemy territory to get gold needed to buy those city-states.

Songhai - Sentry Turret + Horse Archer

Receive triple gold from Horse Archers and Amphibious Sentry Turrets invading cities.

Spain - Kris Swordsman + Slinger

Spain are now the ultimate gambling civ. Your gambling on finding a wonder to make your ability relevant, your gambling on what promotion you get from the Kris Swordsman and your gambling on whether the Slinger will help defeat barbarians or will end up failing to protect your workers.

Sweden - Merchant of Venice + Coffee House

Sweden will produce more great people than anyone thanks to their ability and the Coffee House. Some of these great people will be the Merchants of Venice who can either buy you a city (which you can annex) or gain a huge amount of gold which could buy you even more city-state allies.

Venice - Pracinha + Longhouse

Okay, so Venice are nerfed quite badly now they have lost their Merchants so I decided to make them the worst civ possible. Challenge: Win any way other than through Diplomatic Victory on Deity with this civ.

Zulus - Winged Hussar + Royal Library

Put a great work and a barracks in the same city and you get two promotions immediately with The Zulus’ ability. The Winged Hussar starts with Shock I, letting them get Shock III/Siege/Formation/Charge as soon as they’re built.