The United States has made reservations that none of the articles should restrict the right of free speech and association ; that the US government may impose capital punishment on any person other than a pregnant woman, including persons below the age of 18; that "cruel, inhuman and degrading treatment or punishment" refers to those treatments or punishments prohibited by one or more of the fifth , eighth , and fourteenth amendments to the US Constitution; that Paragraph 1, Article 15 will not apply; and that, notwithstanding paragraphs 2(b) and 3 of Article 10 and paragraph 4 of Article 14, the US government may treat juveniles as adults, and accept volunteers to the military prior to the age of 18. The United States also submitted five "understandings", and four "declarations". 
1. Any State Party to the present Covenant may propose an amendment and file it with the Secretary-General of the United Nations. The Secretary-General shall thereupon communicate any proposed amendments to the States Parties to the present Covenant with a request that they notify him whether they favour a conference of States Parties for the purpose of considering and voting upon the proposals. In the event that at least one third of the States Parties favours such a conference, the Secretary-General shall convene the conference under the auspices of the United Nations. Any amendment adopted by a majority of the States Parties present and voting at the conference shall be submitted to the General Assembly of the United Nations for approval.
As a social science, contemporary political science started to take shape in the latter half of the 19th century. At that time it began to separate itself from political philosophy, which traces its roots back to the works of Chanakya , Aristotle and Plato which were written nearly 2,500 years ago. The term "political science" was not always distinguished from political philosophy, and the modern discipline has a clear set of antecedents including also moral philosophy, political economy, political theology, history, and other fields concerned with normative determinations of what ought to be and with deducing the characteristics and functions of the ideal state.