The contract Chain was a series of a league, federation, and treaties formed and specified during the 17th century, mainly between the Haudenosaunee or Iroquois Confederacy and the British colonies of North America, joined with Indian tribes. First elaborated in specified degree area of New York at a time of cruelty and social uncertainty for the community and Native Americans, the Iroquois, and English committee, and future treaties were based on supporting peace and solidity to conserve and sustain trade. They inscribe issues of inhabitant settlement and tried to subdue cruelty between colonists and the tribes of Indian.They even declared its neutrality.
The answer is creation of written languages
A
To my knowledge, a senator needs to live in the US for 10 years
It's important to know the difference between an alliance and an entente in order to answer this question.
alliance means that when one enters a war, every ally of that country enters as well. entente means that when one enters a war, others are not required to.
the Triple Alliance meant that once war started for Austria-Hungary, war also began for the Allied German States and Italy.
however, although Serbia (where the Alliance was attacking) was "friends" with the entente, it was not a member of the Triple Entente--and because as an entente they were not required to fight for one another anyway--it was up to France, Britain, and Russia had the option to join or not.
but all ended up joining because, to put it jokingly, "their friends are fighting our friends!"