What word in the preamble of the constitution indicate that the farmers wanted the constitution to last forever?

In the preamble of the constitution the word "posterity" is used to signify that this document will last for generations to come. By using this term, the Framers wanted to give a sense of perpetuity to the constitution as milestone in the configuration of  the United States of America.

Posterity

The word is used in the Constitution to mean that it was also written for future generation. The founding fathers were visionaries that envisaged a document that would create a great republic and hoped that years later people will appreciate it

d is the best answer for this question.

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.