Questions

Radiocarbon dating also referred to as carbon dating or carbon-14 dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

Article-20 of the Constitutiongrants protection against arbitrary and excessive punishment to an accused person. It contains three provisions in that direction No Ex-post-facto Law No person shall be convicted of any offence except for violation of a law in force at the time of the commission of the Act nor subjected to a penalty greater than that prescribed by the law in force at the time ofthe commission of the Act.No Double Jeopardy No person shall be prosecuted and punished for the same offence more than once.No Self-incrimination No person accused of any offence shall be compelled to be a witness against himself.As per the Constitution, a person/entity can be tried retrospectively in certain instances as provided by the law

From the history,

The Erie Canal was completed in 1800's

The signing of the Declaration of Independence in 1776 and after that the American Revolution was started in the same 1776.

The Iroquios Confederacy was formed early when the Europeans first began comonizing, may be early in 1600's.

So, from the above data of history, Iroquois tribes formed the Iroquois Confederacy was the event that occured first among the options.