Answer:
Well based on the fact that the very first patented rock crushing machine was made in the year 1830, and the first successful, Eli Whitney Blake's, was in 1858, I'd say the development process was around 30 years.
It was named “Little Boy” dropped in Hiroshima in world War 2
Answer:
In his farewell Presidential address, George Washington advised American citizens to view themselves as a cohesive unit and avoid political parties and issued a special warning to be wary of attachments and entanglements with other nations.
Explanation:
i think
