Answer:
The most critical policy issue facing America today is the rivalry between Democrats and Republicans, Antifa and Trump supporters, left and right, progressives and conservatives; in short, the inherent social conflict in American society today, which is creating a series of increasingly serious social confrontations among the nation's citizens. Clear examples of this situation are the assassination of George Floyd, the assault on the Capitol by Trump's followers, the constant excesses of Antifa in his mobilizations, and the growing tension between both political groups.
Unfortunately, our government is not taking the necessary measures to unite the nation, but rather each political party operates according to its own interests, increasing the severity of the problem more and more.
One key similarity would be that they all started off as colonial powers ruled by larger power in Europe. Most of these nations gained independence through revolution as well, while a smaller amount gained it by the European state giving the colony independence (canada, Jamaica), Cuba was also technically both (revolution against spanish to be ruled by America, given Independence by America). A big difference is that most of North america was ruled by the British and the French, while South and Central America were settled predominantly by the Spanish and Portuguese. This resulted in huge differences in culture, including language (English/french vs Spanish/Portuguese) and religion (Protestantism vs Catholicism).
