Question

what was the cause behind the emergence of various small Kingdoms in the 14th and 15th centuries?​

Answer 1

The 14th Century 1300 - 1399, was a period of great human suffering as the Black Death crept its way across Europe. It decimated the population of Britain which in turn left the survivors in a new world, one in which the power of the Church had undertaken a seismic shift.From the middle to the end of the 14th century, Europe was struck with the devastating pandemic of the Black Death — the bubonic plague — which in the short span of 1348–1350 wiped out fully one-third of the population. ... The plague continued to recur, though not in such virulent form, in every decade of the century.