The correct answer to this open question is the following.
Although the question does not include options, we can answer the following.
Many middle colonies were created so that people could gain wealth but in contrast, many New England colonies served as a refuge for people who faced religious persecution.
That was the case of the Puritans, that had so many differences in Britain with the Church of England and were persecuted for religious motives. The Puritans decided to emigrate to North America and arrived at Cape Town, Massachusets in 1620. There, they founded the Plymouth colony, a place where they could live and teach their strict religious principles.
The primary mission of the United Nations is to help different countries, such as the United States, unite and maintain world peace. Also at the United Nations, country leaders address world issues such as climate change.
The Kansas-Nebraska Act was passed by the U.S. Congress on May 30, 1854. It allowed people in the territories of Kansas and Nebraska to decide for themselves whether or not to allow slavery within their borders. The Act served to repeal the Missouri Compromise of 1820 which prohibited slavery north of latitude 36°30´.
I think subcontinent is the large region separated by water
The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.
