We would like you to assess the QUALITY of each of the following argument (discussing Gun Control) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gun control. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gun control.

They did so on the basis that blacks were not citizens, and thus did not have the same rights, including the right to keep and bear arms protected in the Second Amendment to the U.S. Constitution, as whites.
Valid

Secondly, as pointed out many times before - if you're comparing to the UK and the US, looking at violent crime rates is hardly a way to persuade anyone that the US has the right laws.
Valid

The number of background checks carried out for the purpose of buying a firearm have increased.

Valid