I believe the answer is A !
Yes because
First Nations opinions on immigrants is different than the rest of society. Immigrants affect society and the economy in a positive way, by having education and skills from different countries and bringing it to Canada so we can have more workers for economic jobs, that help Canada's economy grow.
Renewable energy sources are important in Eastern Europe because they allow sustainable development.
The correct answers are A) It accelerated migration to the West Coast and D) It added an additional slave state to the country.
The discovery of gold in California impacted western expansion in that it accelerated migration to the West Coast and it added an additional slave state to the country.
After the United States purchased the Louisiana territory in 1803, US President Thomas Jefferson ordered the exploration of the new territories with the Lewis and Clark Expedition. Two years later, both explorers delivered the results of their exploration and President Jefferson supported the occupation of those lands. So the westward expansion started. Thousands of people started to move west using the Oregon Trail to fulfill the Manifested Destiny.