C. the government began to insist that immigrants attend lessons in child care.
The clause is really a state's rights clause. A state may not pass a law that makes something illegal that was legal before the law was passed. In other words if a state suddenly passed a law that said it is no longer legal to park your car in front of any government building, but it was legal to do so yesterday, the police cannot come to your door and issue a ticket for parking in front of a government building because you did it yesterday.
The constitution actually uses the phrase ex post facto law in Article 1 Section 10 Clause 1.
Japan remained neutral, fearing reprisals from more advanced militaries. Japan was colonized by the United States and forced to modernize. Following the model of Western imperialism, Japan expanded its empire. Japan opposed imperialism and fought for Asian sovereignty.
