Which is a factor that likely explains the choice of the united states to be isolationist or internationalist in its foreign policy in the twentieth century?

Why was the united nations established

All of the following were weaknesses of the articles of confederation, except: a) the central government was not permitted to regulate state, interstate, or foreign trade. b) the central government was not permitted to borrow money. c) the central government had little ability to regulate money. d) the central government had no ability to tax.

Why caused john quincy adams to write the monroe doctrine?