They used Maginot Line. The Maginot Line was built to fulfill several purposes: To prevent a German surprise attack. ... To push Germany into an effort to circumvent via Switzerland or Belgium, and allow France to fight the next war off French soil to avoid a repeat of 1914–1918. To be used as a basis for a counter-offensive.
It was the second war of American independence.
The answer is (D. layers of government).
A. it took a few decades. The court ruled that even if they are separate, as long as they are equal, it was okay.