Answer:
They can lead to the lifting of sanctions.
Explanation:
Aid doesn't help an economy.
Competing with the United States is more like a result of having a developed economy, rather than a cause of an economy developing. Plus, the United States wouldn't likely export the same things as a developing nation.
International trade agreements don't help an economy to 'grow quickly', plus this is a really general answer.
The lifting of sanctions is really important. It's hard to develop under sanctions. Trade agreements allow for the regulation, reduction and removal of sanctions. For example, if the US made a trade deal with Mexico, it would greatly help Mexico to develop, as they would now be trading more freely with the United States.
Migrants from China came in large numbers to participate in the gold rush.
The main factor that led to the development of the four major river valley civilizations was its closeness to rivers, which was a food source, its flooding allowed for fertile soil, allowed easy transportation and cities near them were easier to defend.
The fact that fewer people had to dedicate to the production of food allowed some of them to develop other activities, such as the construction of building and cities, metal working, trade and social organization. This led to a social division, the ones that worked and the ones that ruled, creating intricate systems of governments and religions that ideologically sustained those in power.
