Verify the historical accuracy of the following claims regarding post-independence political agitations in North Eastern India:
1. Marginalized non-Assamese tribal factions lobbied for the geographical partitioning of Assam to establish autonomous statehood.
2. Insurgent groups operating within the Mizo hills justified their armed campaign for sovereignty by arguing they were historically excluded from the British Indian Empire.
3. The overarching political and militant operations of the Naga independence movement were organized and commanded by Laldenga.