By bringing different and diverse races, cultures, religions and languages.
the correct answer is (B) building missions.
The missions were built by the Spanish starting the year 1769 in order to "colonize" the territory of Alta California, which they had discovered over two centuries earlier. The mission system required that Indians brought into a mission by being baptized into the faith and through this they could become"civilized." This was considered a big plus for supporting the use missions as the central element in colonization.
After the passage of the 1965 Immigration Act, most immigrants to the United States came from Latin America and Asia.
The Great Wall of China, built more than 2,000 years ago, stands as one of the monumental feats of ancient engineering. But before the Great Wall, warring Chinese dynasties built many other walls for protection. There are 7,000 watchtowers, blockhouses for soldiers, and beacons to send smoke signals. Nineteen walls have been built that were called the Great Wall of China. The first was built in the 7th century BC.