Abigail Adams
The second first lady in all of history, Abigail Adams managed to make quite an impression while her husband, John Adams, was the President of the United States.
She was the unofficial adviser of her husband, helping him to decide on the XYZ Affair, Sedition Act, and Alien Act.
Also, she advocated for the rights of women when it wasn’t really that fashionable. In 1784, she joined her husband in Europe, when he initiated serving as an American minister to Britain.
Her letters from Paris and London always had descriptive musings on British royalty, French customs, and how superior was the quiet life of an American farmer.