Below are images of the starting setup of national ports.
The difficulty rating indicates the starting setup of national ports. The more difficult nations have a smaller amount of ports to start with, thus being more harder to spread and provide resources for the nation and vice versa. Difficulty rating should not be addressed as a permanent value, as it changes server to server depending on the port distribution across nations.
Britain
The British capital is Kingston
The British Flag can be seen to the right
Difficulty: easy
Commonwealth of Poland
The Commonwealth of Poland is a newly added nation (October 2017)
Denmark
The Danish capital is Christiansted
The Danish flag can be seen to the right
Difficulty: hard
United Provinces(the Dutch)
The Dutch capital is Willemstad
The Dutch Flag can be seen to the right
Difficulty: medium
France
The French Capital is Fort Royal
The French flag can be seen to the right
Difficulty: medium
Neutral
After patch 9.61 neutrals are no longer a playable nation
Pirates
The pirate Capital is Mortimer Town
Difficulty: Medium
Prussia
Prussia is a newly added nation (October 2017)
Russia
Russia is a newly added nation (October 2017)
Spain
The Spanish Capital is La Habana
The Spanish flag can be seen to the right
Difficulty: easy
Sweden
The Swedish capital is Gustavia
The Swedish flag can be seen to the right
Difficulty: hard
United States
The US Capital is Charleston
The US flag can be seen on the right.
Difficulty: medium