The area of the U. S. that stretches east from the Rocky Mountains to the Mississippi River is the:

Great Plains

Explanation:

The Great Plains are found between the Mississippi River and the Rocky Mountains. It is an expanse of basically flat grasslands found in ten U.S states.

the growing interconnectedness of the world through communication, trade, and the exchange of ideas is an important theme in the history of the 20th and 21st centuries.

explanation:

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on