Are the region capital build slots pre-determined? I started a game as United Provinces and can't build an admiralty anywhere. I have a region capital with a few open slots but can only build the opera house line and the cannon maker line.

Also, trade is limited to how many trade routes you are allowed in your home province. The Dutch only have 1 port on their home province so only start with 3 foreign trade routes allowed. Do other countries with more than 1 port in their capital have a chance for more?