The most important work was
Explanation: Warren completed History of the Rise, Progress and Termination of the American Revolution in 1805, making her the first woman to write a history of the Revolution.
America is a 1st world country with plenty of job opportunities and better living conditions a than most other countries.
Washington and the first congress had to make numerous decisions about the new government, since there was no precedent--such as how to establish a cabinet, how the present would be greeted, whether the president would be present during sessions of congress, etc,
Grace period seems correct
