The answer is
d) voting and employment
The first lines talk about giving the right to vote to an individual despite making a mistake in trying to vote as long as his mistake is not a result of his inability to select a proper candidate
The last lines talk about giving equal opportunity to an individual to be hired for a job regardless of race, sex or national origin.
In the 1800s, the Know-Nothing Party worked to accomplish which of the following?
restrictions on immigration
The historians could be wrong without proper proof to back up their so-called "facts". Therefore, they would need to study and know what they're talking about, before presenting their statements as facts.