Many european nations and america desired to expand their "spheres of influence" and control parts of China for their own 'empire', which enables the nations to get more resources and other 'exotic' things that they do not have in their native lands.
The anti-federalist felt that the constitution would give too much power to the federal government. They basically were opposed because of what was in it or what wasn't in it because of fear that their civil liberties would be stripped off due to everyone functioning off of the constitution. They more so wanted a bill of rights to proclaim all the liberties a citizen is granted to avoid this.
It was "The Great Compromise" that the Framers made at the beginning of the Philadelphia convention, which established two houses in the legislature: the House of Representatives and the Senate.
