How can a citizens of the united states can lose their natural right to liberty?

Human rights in the United States comprise a series of rights which are legally protected by the Constitution of the United States, including the amendments,[1][2] state constitutions, conferred by treaty and customary international law, and enacted legislatively through Congress, state legislatures, and state referenda and citizen's initiatives. Federal courts in the United States have jurisdiction over international human rights laws as a federal question, arising under international law, which is part of the law of the United States.[3]

The human rights record of the United States of America is a complex matter with varying opinions; first and foremost the Federal Government of the United States has, through a ratified constitution, guaranteed unalienablerights to citizens of the country, and also to some degree, non-citizens. These rights evolved over time through constitutional amendments, supported by legislation and judicial precedent. Along with the rights themselves, the periphery of the population who had access to these rights has expanded over time. Today, the United States has a vibrant civil society and strong constitutional protections for many civil and political rights.[4]

On a number of human rights issues, the United States has been internationally criticized for its human rights record, including the least protections for workers of most Western countries,[5] the imprisonment of debtors,[6] and the criminalization of homelessness and poverty,[7][8][9] the invasion of the privacy of its citizens through surveillance programs,[10] police brutality,[11][12] police impunity,[13] the incarceration of citizens for profit, the mistreatment of prisoners and juveniles in the prison system, having the longest prison sentences of any country, being the last Western country with a death penalty, abuses of illegal immigrants,[14] including children,[15][16][17] facilitating state terrorism[18]and the continued support for foreign dictators who commit abuses (including genocide),[19][20] forced disappearances, extraordinary renditions, extrajudicial detentions, torture of prisoners at Guantanamo Bay and black sites,  

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.