Without political parties electors would have to evaluate every individual candidate in every single election they are eligible to vote instead parties enable electors to make judgments about a few groups instead of a much larger numbers of individuals
work·er
/ˈwərkər/
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noun
1.
a person who does a specified type of work or who works in a specified way.
"a farm worker"
2.
a person who produces or achieves a specified thing.
"a worker of miracles"
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D. contain relevant information
Authoritative sources are works known to be reliable and highly trusted because its authenticity is extensively recognized by experts. Once your source is reliable, the information you need is certainly relevant to your study.
Authoritative sources could be up to date and have thoughtful opinions, however, any sources could have this too.
Any articles are easy to find simply by using the internet. But the question is, are they reliable?
Many settlers were willing to leave their homes and head west due to the dream of attaining a better life, usually thinking of the possibility of acquiring free or cheap land. Other ocassions were for example, the "gold rush" in which so many went to California in search of gold. Others went west hoping to find more freedom.