The prediction concerns the entire 21st century, asserting that no other country will surpass China as the primary security threat for both India and the United States before 2100. As of today (November 30, 2025), fewer than 75 years remain in that horizon, and we are only about a quarter of the way through the century. There is no way to definitively determine now whether some other power (for example, a resurgent Russia, a future unified bloc, or a currently minor power) might become the top security concern for either country later in the century. Because the claim is explicitly about a long-term future state extending to 2100, it is too early to judge its accuracy. Therefore the correct classification is: inconclusive (too early to tell).