Kaiser.
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Answer:
They make sure that immigration laws are followed and they screen refugees that applied to enter the US.
Explanation:
The Department of Homeland Security,DHS is one of the agencies in the United States of America that is saddled with the responsibility of preventing terrorists into the country. The department of homeland security, DHS make sure that the borders are secure and make sure that the regulations and laws regarding immigration are followed properly.
The department of homeland security also make sure that there is no cyber to the the United States of America.
They make sure that immigration laws are followed and they screen refugees that applied to enter the US.
A parliamentary republic is one where a parliament has its own head of state that is not connected to the president. This is usually in the form of a prime minister and often this prime minister has even more power than the president. An example can be Germany that has a chancellor that is more important than the president and the president has almost no power.
<span> Andrew Johnson was 17th president of united states from year 1865 to 1869
he implemented his own presidentional reconstructioN and </span><span>Johnson's behavior strengthened the unity between moderate and Radical Republicans, and prompted many Democrats to support them as well.
so the correct option is D
HOPE IT HLPS</span>
Why did historians choose to study this topic the correct answer is b