Final answer:
The United States experienced significant changes during the early 19th century, including the acquisition of new territory through the Louisiana Purchase and the ongoing debate over slavery.
Step-by-step explanation:
Two facts about the nation during the early 19th century are:
- In 1803, the United States acquired a vast amount of territory through the Louisiana Purchase, doubling its size and setting the stage for westward expansion.
- In the first half of the 19th century, slavery remained a contentious issue, with the southern states relying heavily on enslaved labor and the northern states increasingly calling for its abolition.