The United States became a big threat to the Spanish colonies with its grow in size and power, both in militaristic and economic aspect, but also very important factor was that the United States with their growth in size managed to get to the Spanish colonies, thus share a land border with them. With the countries being separated just by an imaginary line, it was much more dangerous for the Spanish because they were not as strong as they used to be, and they had a growing power knocking on their door.
The main reason why rice became a Chinese staple food during the Tang dynasty was because it was so plentiful and had all the basic nutrients that were needed for survival.
They feared a pattern of increased taxation and restricted liberties.
Answer:
Explain why the invention of rubber tires for bikes contributed to the rise of tourism. ... It was cheaper than using a horse - in fact there was a whole craze around using bikes. Bikes actually created the concept of better roads - for travel by bike, not cars, which were too expensive.