Citizen's rights and responsibilities stem from the constitution as they were given to us by our creator according to the constitution. The European ideology claimed that all people are equal (in terms of caste, religion and status) and developed from the enlightenment era.
The citizenship can be obtained by anyone as long as they live in the country long and pay taxes and behave like anyone else would behave. The political thinkers such as John Locke came up with the same idea and thinking which heavily influenced the US constitution.