The European nation wanted to gain more wealth and power from these nations. They were able to gain gold through the plantation that were created by the European colonies. They were able to gather more people in their colony through slaves and indentured slaves.
In 1850s, the main occupation of the people arriving in Oregon and California is gold mining. Thus, the answer is letter B. In May of 1848, a newsletter proclaimed about the gold mines found in the lands and many people from the neighboring places flocked to the place.
That person is called an IMMIGRANT
They spread knowledge of medicine, mathematics, and other sciences. The hindu-arabic mathematical numerals 0-9 is still used today.
