Notes

NEW Technology - Compass - 150g (Feudalism needed) - Allows you to upgrade your Shipyard
NEW Technology - Machinery - 150g (Feudalism needed) - Allows you to build Workshop

Feudalism - 200g (Iron needed) - Increase income from farms by 10 - Increase income of capital by 50 (total 200) - your state is now made of regions, draw them for your country plz.

Technology - Main Roads - 150g (Iron needed) - Increase income of your cities by 10 (total 60) + cities on map will be connected with cool lines! (capital doesnt count)

Technology - Mountaineering - 50g - Allows you to expand into mountains

Technology - IRON - Upgrades your trade income from Caravan - by 5g/caravan -, Docks - by 10/player -, Your Capital - by 50g - and upgrades your units. Cost 150g

Religion - 150g - allows you to create your own religion (MAX 3, Limit may increase over time). When you create your religion you can send ask players to join your religion. For every member of the religion, the head of the religion will get +25g income. If the religion is the most selected religion, every member will also get +25g income. Capital city of the head will became holy city of the religion and if it's captured (IF IT'S HOLY CITY IT WILL NOT BE DESTROYED AFTER CAPTURE, INSTEAD IT WILL BECOME NORMAL CITY) and income from bonuses will be removed until the Head will recapture the city. (IF CAPTURED BY SAME RELIGION, THE PLAYER WHO CAPTURED IT WILL BECOME HEAD OF RELIGION)
EDIT TURN 4 - MAX 3 PLAYERS IN RELIGION IF 1 RELIGION INGAME, 4 IF 2, 5 IF 3 (HEADS DONT COUNT)
NEW - You can leave religion and you can go to another one but you have to pay 50g to religious head.

City limit - 50g - increases limit of cities by 1
City - 100g - gives 50g per turn
NOTE! If captured, previous player will lose its income, the player who captured it will get the income instead. It will be shown on the map.

Capital - FREE (max 1 per country, if destroyed you can build it again for free) - gives 100g per turn
NOTE! If capital is destroyed, you will have to surrender. Winner of a war can only take land that he captured. So if France was attacking Italy and captured Rome, but not Naples etc. It can't take it.

Farm limit - 50g - increases limit of farms by 2
Farm - 40g - gives 20g per turn
Crop Rotation - 25g - decreases cost of Farm limit by 10g - Iron Needed
NOTE! Not shown on the map and cannot be captured!

Shipyard - 100g - allows you to recruit ships - Iron Needed
Harbor - 100g - allows you to recruit Caravels - Compass Needed

Galley - 3/3 - 50g
Explosive Ship - 5/1 - 50g
Trireme - 2/4 - 50g
Caravel - 3/3 - 50g - allows you to do exloration missions for a short destination

Barracks - 100g - allows you to recruit soldiers
Archery - 50g (requires barracks) - allows you to recruit archers
Stables -50g (requires barracks, iron) - allows you to recruit cavalry
Chivalry - 50g (requires stables) - upgrades your mounted units
Workshop - 100g (requires barracks & machinery) - allows you to recruit catapults & upgrades ranged units.

Melee - Swordsman - 2/1 - 20g -> Footman - 3/2 - 40g
Melee - Pikeman - 1/2 - 20g -> Spearman - 2/3 - 40g
Ranged - Archer - 2/1 - 30g -> Sharpshooter - 3/1 - 40g -> Crossbowman - 4/1 - 50g
Ranged - Arbalester - 2/4 (strong defense against other Ranged) - 50g
Melee - Sword Cavalry - 3/1 - 30g -> Knight - 4/3 - 50g
Melee - Spear Cavalry - 1/3 - 30g -> Hussar 3/4 - 50g

Docks - 100g - allows you to trade with other players with docks - 25g for every player (max 4 players) - only 1 available - ONLY WHEN YOU HAVE ACCESS TO SEA
Caravan - 50g - allows you to trade with other player who you share a land with - 30g income