Answer:
Why does Abigail Adams describe herself as feeling cheerful and lighthearted in the March 31st (opening) section of her "Letter to John Adams"? because the colonies are about to declare independence from Britain.
Explanation:
Abigail Adams was one of only two women to have been both wife and mother to two U.S. presidents (the other being Barbara Bush). Often separated from her husband due to his political work, the self-educated Abigail oversaw the family’s household and largely raised their four children on her own, all the while maintaining a lively lifelong correspondence with her husband on the political issues of the day. She was also famous for her early advocacy of several divisive causes, including women’s rights, female education and the abolition of slavery.