Answer:
I would consider the adoption of gun powder
Explanation:
gun powder changed the world and is still widely used today for guns, explosives and rockets.
D.)increased migration of people for economic opportunity
Gold, and other natural resources the new world had to offer
I've had to do this so I know that:
--2500 BC--
Back in 2500 BC people spent there time in the Indus River Valley by farming (which the women did), hunting down for food (which the men did) while sometimes teaching their sons to do so as well, and getting water from the to rivers of Mesopotamia. (The Tigris river and the Euphrates river).
--Today--
But nowadays people still live there (I think) and do the same but of course don't hunt for food because there are supermarkets and they get water there as well but many people may still get water from the river.
I hope this helped! If it did, ask me more questions and I will be sure to answer them! :)
Answer: Rows of stars (4-5-4 or 3-2-3-2-3) were common, but many other variations also existed. The new Stars and Stripes formed part of the military colours carried on September 11, 1777, at the Battle of the Brandywine, perhaps its first such use. U.S. flag commonly attributed to Betsy Ross The U.S. flag commonly attributed to Betsy Ross. In the context of combinatorial mathematics, stars and bars is a graphical aid for deriving certain combinatorial theorems. It was popularized by William Feller in his classic book on probability. It can be used to solve many simple counting problems, such as how many ways there are to put n indistinguishable balls into k distinguishable bins.
Hope this helps :)
