Coming to yr questions Crazyhorse, there must be plenty of chronological details about Buddha available in web. The verbal history, i remember reading as a kid is, Kirants used to rule Nepal. Hows the relation between then Nepal and Siddhartha Gautam's Dad king Suddhodhan is still a debatable subject. Buddha visited kathmandu valley around the time of 7th kiranti king. I think Jitedasti was the king of Nepal then. Kirantis ruled was over in the time of 14th kiranti king, Gasti. India was not an unified, greater india in the times of Buddha. It was ruled by different rulers and divided into different territories from Persia in the west to Bramhaputra River in east. Most powerful indian king was the king of Patliputra (near to patna). Alexander has not ascended to thorne in macedonia.

After Buddha, history got excited and statrted walking in faster paces(hahaha). Alexander(called sikkandar in india) defeats persian king and invades india. Alexander establishes his people as care taker in kandhar( present day kandhahar in afganistan) and moves to eastern part of india. In America's war in afghanistan, u have heard analysts saying afghanistan as a country where no invaders have won in the history. Kandhar was the place for great education then. Ancient economist chanakya had earned his SHIKHYA there and was a teacher there. He built a coalition of indian kings from different territories to fight against Alexander. The head of that coalition was ChandraGupta. After the demise of Alexander, ChandraGupta unites India with the help of Chanakya. Chandragupta's grand-son is King Ashok. Probably, u have seen the movie Ahoka. King Ashoka converts into Buddhist after kaling's war. He visits Lumbini and we still see that monument there in Lumbini. He visits Kathmandu too and leave her daughter charumati in Patan. Licchavis have already taken over Nepal.

For your religion class....have u ever wondered about Polythenisian Civilizations vs Monothenisian civilizations ( I hope, i have spelled them correctly)?