It's spelled Krakow, and it is in Poland. What happened to the
Jews there during the Holocaust; they were first concentrated into
a ghetto in the city. Then they were put in a concentration camp in
the city's district of Plaszow, or to Auschwitz-Birkenau.
The US constitution pre-dated the Holocaust by about 150 years,
it did not prevent the Holocaust happening the first time.
The Holocaust happened very far away from the USA, whether the
US even had a constitution was totally irrelevant.