Suggestions

Just a system that has natural resources that would be extractable depending on what territory your country is located They would be useful to build stuff such as buildings or focus on the army. And you could also donate them to countries in need as a way to help them or improve relations. And you could also steal the resources located in the provinces when you annex those provinces.

This economy system would be more sensible that could have a bigger impact in the economy in general and the economical sectors. Things like these could happen if your nation isn't investing enough in vital areas, or if it's investing too much on a single one that isn't too important. Depending on the size and influence of the country, an economical crash would bring the economy of its allies and non-isolationist countries together.

It would be cool and very important because we have many occupations right now like South East Ukraine, Gaza Strip etc.

A system that will mensure how much diplomatic power a country has, this would help to prevent and stop wars and would help in improving relations with other nations. An example is the US, being very influential and being a western capitalist country. This will help the US grow relations with other conservative countries and have their own interests in preventing or causing wars in the globe. And there's North Korea, which is the opposite of the US. They're a communist dictatorial country, so the relations between them and the US would be automatically low. On the other hand, the relations between another conservative/liberal power woul…

The investment system of Age of History 2 was really bad. If you have a large country, it becomes really difficult to invest in every region. It would be really good if this could be done automatically instead of manually, or a simpler system could be introduced.