an immediate effect of the end of the romanov dynasty in russia and the end of hapsburg reign in the austria-hungary was that they resulted in

The disolution of empires and autocratic monarchies and its dismemberment with new countries based on national culture.

Explanation:

The immediate effect of the end of both dynasties was the dissapearing of both empires and territorial dismemberment based on national cultures, since both empires ruled over a group of ethnic groups.