In exchange, the United States pledged to avoid involvement in the political affairs of Europe, such as the ongoing Greek struggle for independence from the Ottoman Empire, and not to interfere in the existing European colonies already in the Americas.
The answer is European colonies that are already existing in the Americans.
State Representation is based off the population of the state, since slaves weren't technically citizens, they were not counted in deciding how many representatives a state had. Slaves were a large majority of the population in the south. The south thought they were under represented and wanted slaves to be counted so representation was fair in their eyes.
It rests with the states
It is a responsibility of the states to organize elections either for presidents or for those in the congress and it is their duty to ensure that the elections go smoothly and without any affairs or cheating. The states vary in how they conduct the elections, but most do it under the same pattern while following rules found in the constitution.
Either 2 or 3. I think it is probably 2, though.