Impeachment charges are brought against government officials by C. the House of Representatives.
It is the only body which has such authorities as to impeach someone. It can initiate the impeachment, whereas the Senate has the right to try such impeachments, but cannot start the whole process itself - it is what H.O.R. does.
Today we trade (aka imperialism) by paying , or going into stores , this is different from back then because we use to just give each other items in exchange for something or to learn something.
Imperialism is just another word for trade really.
i really hope this helps you a lot. :)