<em>could you be a little more clear on what the question is...?</em>
I assume you mean in the United Kingdom?
In the United Kingdom the prime minister is appointed by the Queen (or King) who chooses the person who is most likely to have a majority in the House of Commons (most likely the leader of the winning party)
Money and Greed were the main factors driving them to exploit and plunder, combined with the British sense of superiority over its colonies and colonial people.