Given the ability to deport foreigners
Concept of manifest destiny was based on expansionism.
Explanation:
Manifest destiny was started during 19th century in US by John O' Sullivan , he was a journalist by profession. The people believed that the country's main aim was to expand. The main idea behind Manifest destiny is to capture more land that will be beneficial for cultivation purpose mainly the people focused in cotton cultivation and this would spread slavery to these parts as well.
The effect was that it included expansion of westward portion of the United States as well as there was increase in tension regarding political interests between Northern and Southern parts.
Various drawback was there, they are as follows, There was increase in slavery, It is unconstitutional by nature, many people died as well as suffered specially Indians, war and conflicts took place.
Both B and D took place, but if you had to choose one, it would be B. The technological advances made farming much more quicker and easier for a large piece of land.
look at the pic and you will find the answer
He used more pacifistic methods in order to help free India from the British raj, or harsh rule (loose translation). Some of these methods would be simple defiance by taking his own salt when there was a law saying that they can't collect their own, or by starving himself for extended periods of time.
This is what I know if you find something better I encourage you to use it, this is at least the basic premise and a few examples.
I hope it helps.