The Articles of Confederation was the first established United States constitution. It provided a foundation for the Constitution itself, but was very flawed. A major flaw was the system of government: the Articles of Confederation only had one house (Congress) which would assert all power, becoming an authoritarian government. The US Constitution established checks and balances between the legislative, executive, and judicial branches so they can evaluate a law and see if it is just and pertains to the Constitution. This created the government we have now, a Constitutional Republic. I hope this answered your question!!!
Nearly 90% of Canada's population lives within 100 miles of the border of the United States. The correct option among all the options that are given in the question is the last option or option "D. The main reason for such population density within a specific region is that the central and north of Canada are mainly desert and Tundra.