GSTAL
Where did u learn your history from? Hope your technical knowledge is better than that!
Hinduism and Buddhism never spread due to any invasion or annexation. It was because international students learned the philosophies or ways of life from world famous Universities like Pataliputra etc and carried it back with them... Much like western countries practise and preach yoga and ISKON in todays era. To give it a level of authenticity they quote Hindu gurus... If you think like a typical westerner than you may call this"world domination"
But apologies I do not wish to sidetrack the main issue here....