Membership with the North Atlantic Treaty Organization (NATO).
Explanation:
The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental military alliance. Currently, 29 North American and European countries are members of NATO. This organization is actually a collective defense system in which the countries involved agree to mutual defense as a response to any attack by an external party.
The rebellion was the result of decades of ethnic and cultural differences between Indian soldiers and their British officers. The indifference of the British towards Indian rulers like the Mughals and ex- Peshwas and the annexation of Oudh were political factors triggering dissent amongst Indians.
