Our foreign policy is very consistent. We dispose of leaders who do not bend over to our companies's interests and replace them with ppl who will let our businesses trample over their citizens.
India is much more likely to foot a large portion of the bill than Canada given their relations with their land border neighbors.
labor is cheaper
cons:
regardless of whether we build only a land wall or both a land and water wall, this is less efficient. Especially when you want to build on the Himalayas.
building a wall, and thus, cementing highly disputed borders in the region could result in war between high population countries with nukes.