Conquest is not enogh to make a nation;
Ghanghez Khan; Tamerlane; Alexander conquered huqe area; but non claimed that they made nation.
Definition of Nation is: a large body of people, associated with a particular territory, that is sufficiently conscious of its unity to seek or to possess a government peculiarly its own:
All these victories fizzled, and multiple kingdoms fought for supremacy with each other;
Sub-continent was home to multitude of nations, tribe, kingdoms through out the ancient time; just like Europe, but not a single Nation