Which of the following examples is not grounds for losing ones american citizenship?

The correct answer is : Marrying a citizen of a foreign country

Marrying a citizen of a foreign country does not revoke one's American citizenship. However, the American law clearly states a number of 'offences' that may prove as grounds to lose American nationality.

For example,

1. Joining the Military of a Foreign country, which might be bad for national security.

2. Take up a government position in another country

etc.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.