The steam boat
The cotton gin and others
Answer: The 2,200-mile east-west trail served as a critical transportation route for emigrants traveling from Missouri to Oregon and other points west during the mid-1800s. Travelers were inspired by dreams of gold and rich farmlands, but they were also motivated by difficult economic times in the east and diseases like yellow fever and malaria that were decimating the Midwest around 1837.
Explanation:
While consumers and producers obviously make most decisions that mold the economy, government activities have at least four powerful effects on the U.S. economy:
Direct Services
Regulation and Control
Stabilization and Growth
Direct assistance
pyramid :dead bodies are being kept in pyramid.
papyrus:papyrus is a type of a paper.
canals:the canal is opening to shipping.
dams:a dam is under construction.
mummification:the Egyptian did not stop at mummification of the human body.
metallurgy:he studied metallurgy as a mature student