Rothschild and Rockefeller families are known around the world because of their trillions of wealth and dozens of companies which have net assets that worth more than many countries.
To truly understand their power you should know that even the site for United Nations building in New York was donated by Rockefeller family.
World first billionaire was also from Rockefeller family, they held positions including the mayor house of New York City, they control the Federal Reserve of USA and they run many think tanks and associations which give suggestions to government from education system to international affairs.
It has been observed that that these families control the government not only through these acts but rather they fund the presidential campaign of president in USA.
So when a politician wins election by using funds from these families he is bound to give something back.