This citizenship is called a dual citizenship because let's say for example Mexico and America, that person would have citizenship to America AND Mexico.
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It necessary and proper clause a source of ongoing debate because the clause deals with powers that are misinterpreted and are ambiguous. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
The government had agreed to stop funding Shinto, which those they made the treaty with hoped this would take power away from the Emperor. So Shinto became more of a culture thing instead of a religious thing.
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The biggest issues in europe after the war was large debt, broken economy and having to finance reconstruction.