What is the object (not the name) in the image above?

What is the relation between the hover dam and the gold rush

What was zheng he’s most important accomplishment? zheng he spread chinese ideas and brought wealth to china from his travels. zheng he commanded an impressive fleet of ships. zheng he sailed the indian ocean and around africa. zheng he conquered lands as far away as africa to increase the dynasty’s power.

What events and ideas connected to andrew jackson led to patterns of change in the united states? how did things stay the same.