The answer is B. marrying a citizen of a forigen country.
Answer:
A Tariff
Explanation:
............,.,,,........llll
50.
According to sources, the number of sovereign states in the half of the 20th century were almost 50. This means that there was an increasing number of states that were acknowledging independence and power -equality among other country.
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The key ideas were about power and how leaders
specifically princes could seek to gain power and also how they could go about
maintaining power. These ideas helped to influence European rulers
and individuals around the world by promoting this particular type of
leadership and power seeking. Hope this helps, good luck.