It began with the fall of the Western Roman Empire and merged into the Renaissance
Answer:
for more troops to fight in the war so not as many mainland men had to be used.
Explanation:
Some colonial troops remained in Europe and were used for manual labor. They dug trenches, moved supplies, and cleared battlefields.
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.
