It consist of three branches which are executive, legislative, and judicial,.
Using simple words, imperialism is a policy of certain country involving a will of extending its power by using any kind of pressure or force.
For example - In 1939 Nazi Germany together with Soviet Russia jointly invaded Poland, in the result, both countries extended its borders.
to be used, and were enslaved in the americas.
Nationalism caused World War 1 . People put nationalism in their country above other countries which caused a lot of conflict
I'm not sure if this is the answer, but they were backed by China
