The citizenship law of the Czech Republic is based on the principles of jus sanguinis or "right by blood".

Where only the father is Czech, and the parents are unmarried, proof of paternity is required — by the parents making a concerted declaration before the Registry Office or a court, submission of a DNA test, or a court determination relating to the paternity of the child.

Parents can apply for their children under 15 years of age, and naturalization occurs at the discretion of the Interior Ministry.

The Slovak provision allowing for this grant expired in 1993, however, the Czech equivalent remains in the citizenship law.

[7] Because Czechoslovakia and the United States had a treaty that forbade dual nationality for those who were naturalized in the other country at the age of 21 or older, the new citizenship by descent (declaration) mainly concerns US citizens with Czech ancestry, as it is easy to prove loss of citizenship with a US naturalization certificate.

[10] During the communist era (1948–89) hundreds of thousands of Czechoslovakian citizens had emigrated into other parts of the West.

The regime punished emigration by removing Czechoslovak citizenship, along with property confiscation and in absentia prison sentences.

The QNI considers, in addition, to travel freedom on internal factors such as peace & stability, economic strength, and human development as well.