The concept of insuring domestic tranquility comes from the Preamble to the U.S. Constitution. It means that the Federal Government owes a duty to maintenance law and peace within the country with the help of the executive branch. It aims at avoiding chaos and rebellion against the public and helps preserve family life and its attendant rights. Police, Fire department, the FBI, hospital, doctors office, and the three branchs of government, they all keep us safe, so no soliders or anyone one can come in our houses and take and look at personal belongings.
It is the duty of the Federal Government to ensure protection within the country from outside invasion and maintain peace and harmony between the different branches and levels of domestic and national governments.
Further information on domestic tranquility can be found at: http://www.fatheadcommunity.com