Well... Government in the United States consists of three separate levels: the federal government, the state governments, and local governments..
I just looked it up and the closet answer is the third one
<span>The threat to internal validity is the Mortality. Internal
validity is the measure in which the causality of the stimuli studied
is analyzed, that is, if the results of the study are due to the
interaction of the variables analyzed or are due to the interaction with
other variables. <span>Mortality is an error that occurs if the
conclusions of the study are made only on the basis of the participants
who were from beginning to end in the investigation, without taking into
account those who left the study.
I hope my answer can help you.
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The sues canal was the cause of the tension in this case
Their goal was to extract gold and silver from the Americans, to stimulate the Spanish economy and make Spain a more powerful country.