The sentence is an example of a cause and effect reasoning. It helps to stablish the relationship between an event that comes first, and the one that takes place after the former. This type of reasoning provides the necessary information and details to understand why certain events happens as they do.
According to character, Englishmen were loose upon politics and had to shift for themselves.
Gulliver, as his name implies, is gullible, or simply deceived:
He tends to trust an excessive amount of in appearances. However, he's not nit witted, as he manages to survive the various perils of his travel.
Is a measure that changes in output per unit of combined inputs. <span />