What system of government is currently used by the United States

The United States is a federal constitutional republic, in which the President of the United States, Congress, and judiciary share powers reserved to the national government, and the federal government shares sovereignty with the state governments.

Explanation:

Hope this helps, if notim really sorry.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

not sure might be he acquired the entire oregon territory from great britain