Why are american citizens so important to preserving our democracy will mark brainliest

Explanation:

In my opinion, Americans have fought over 300 years for the ideas and values upholded in the constitution. These include free speech, open voting, equality, and many more. If the blood of our ancestors have fought for these ideals ever so galiantly flows in our veins, we should also uphold these values.

Hope this helps!

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."