<span>A system of cooperative federalism emerged, as the powers of the federal government expanded.</span>
The first two options, NATO and League of Nations are not processes, but organizations, so they can't be the correct answer.
Then, there isn't really a "Multinational Government", except if you call the EU structure like this (but not the official name).
The correct answer is : globalization, it's the process by which societies become integrated.
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