For 10 points, name this country that bought Louisiana from the French during the presidency of Thomas Jefferson.
One war between this country and its northern neighbor over logging rights was the Aroostook War. Sanford Dole forced a group of islands to join this country, and this country's Open Door Policy with respect to China was formatted by John Hay. This country's military opened Japan to foreign trade by the efforts of Matthew Perry. For 10 points, name this country that bought Louisiana from the French during the presidency of Thomas Jefferson.
One war between this country and its northern neighbor over logging rights was the Aroostook War.
The {United States} of {America} [accept either underlined part; accept {USA}]