In order to retain the national security and restrict the unauthorized illegal entries into US, a new federal law enforcement agency known as Department of Homeland Security (DHS) was created in the year 2002. It is one of the most significant government agencies comprising of three main federal departments such as Customs and Border protection (CBP), US Citizenship and Immigration Services (USCIS) and US Immigration and Custom Enforcement (ICE). However, for all the immigration issues of foreign nationals abroad or overseas, the US department of State Embassy or Consulate is in charge of application processing associated with the refugee status or non-immigrant visas.
As a part of federal government agencies, the USCIS formed on March 1st, 2003, acts as an integral element of DHS holding all immigration responsibilities of the former Immigration and Naturalization Service (INS) to establish the immigration legislation policies and priorities.
Like USCIS, the CBP is also a major division of government agencies, which plays a vital part to prevent the terrorists and other criminals entering into US through borders and other port of entries.
U.S. Immigration and Customs Enforcement (ICE), formed after 9/11 terrorist attack, is one of the largest law enforcement government agencies that is in charge of all functions of former U.S. Customs Service, the INS, the Federal Air Marshals Service and the Federal Protective Service.
Apart from the above government agencies, DOL promotes the welfare of foreign workers by enhancing their working conditions and employment opportunities and also holds the responsibility of certifying the labor condition applications for non-immigrant petitions.
The DOS is also a major federal executive division of government agencies that deals with different US visa tasks, foreign affair activities and co-ordinates with other federal agencies to sustain peace and stability.