What was the most significant technological advancement in the early nineteenth century, and why is it more important than the others?

the northwest ordinance of 1787 guaranteed basic rights for settlers and banned slavery there.

japan is located on a chain of islands called an archipelago. it is made up of four main islands and thousands of smaller ones. the terrain is mountainous, which means there is not a lot of good land for farming. because of the geography, the japanese relied on the sea for many aspects of daily life.