Hitler promised the germans their land back, security, and lives back
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The Constitutional reforms of Augustus were a series of laws that were enacted by the Roman Emperor Augustus between 30 BC and 2 BC, which transformed the Constitution of the Roman Republic into the Constitution of the Roman Empire.
To shortly answer your question, an ethic community is a community of people who relate to each other in terms of culture, traditions, and overall ethnicities. An example of an ethnic community (I am speaking on myself) would be Juneteenth. In no way do I mean offense, it is just a mere example. If you need better understanding, let me know and I will gladly assist you.
They are territory of the United States, but not considered a state.