Final answer:
If Canadians were to invade and claim Pennsylvania for themselves, followed by marching all the U.S. survivors to New York and building a wall to keep Pennsylvania refugees from returning, the result would likely be a significant conflict between Canada and the United States.
Step-by-step explanation:
If Canadians were to invade and claim Pennsylvania for themselves, followed by marching all the U.S. survivors to New York and building a wall to keep Pennsylvania refugees from returning, the result would likely be a significant conflict between Canada and the United States. Such an invasion would be a violation of international law and sovereignty, leading to diplomatic tensions and potentially military action. It is important to note that invading and claiming another country's territory is not an acceptable or legal practice in the modern world.