Slavery might become legal everywhere
They believed that they were not being fairly represented in parliament, hence the phrase "No taxation without representation"
The progressive era brought significant reforms to American industrial capitalism and to the American political system, through participation and activism by ordinary Americans. The progressives had organized to improve the working and living conditions for poor people, only really to address the glaring social and environmental problems, as well as expand opportunies for democratic involvement in the political system.
Northern Africa is mostly desert, and it is extreamly hard to trade w/ the rest of Africa