The battle of Lexington and Concord sparked the revolution and made it look like the militia/irregular warfare favored by the colonists might stand a shot against the great British Army.
This built confidence and enabled people to feel like there might be a shot.
Texas is a very large, second largest US state to be more precise. It has lot of fertile land and vast grasslands, giving the basis for high quality and high quantity production in the farming and ranching industries. It was not until the development of the railroads that this potential was able to be fulfilled. The railroads enabled the products from these two industries to be transported over long distances in a short period of time, which meant that much larger market opened up for their products. Because the market became much larger, and the products were able to get to it without being spoiled or damaged, these two industries in Texas flourished, increasing their production significantly and this state became the leader in the country when these two industries are in question.
Answer 'A' correctly describes the Great Wall = It was built to protect Qin's empire from foreign invasion.
Apart from defense, the Great Wall included border controls, and regulation of goods. After Qin dynasty, other dynasties had used it, to maintain their territories.
