Demography In The Twentieth Century

1- SOCIO-DEMOGRAPHIC REVOLUTION
Undoubtedly, the area that reflects, in the most drastic way, the quickness of changes that occurred in the course of the twentieth century is that of demography, particularly the growth of the human population.
From the beginning of humanity to the early twentieth century, thanks to the significant demographic work this growth was restructured. Very slow in the Paleolithic when humanity was essentially amassers- hunters – fishermen, the demographic growth (of the world population) occurred (happened) under auspicious (more favorable) terms to the Neolithic with the agriculture and the first cities (settlement)'s advent.
Yet, human societies are still very vulnerable to disease and unfriendly natural environment.

Starting as of (from) the end of the eighteenth century in some European countries, it reaches Asia in the second half of the twentieth century hardly begun in sub-Saharan Africa at the end of the century. Due to the differences in the phases (stages) between nations in the transitional demographic process the growth of the population is very different from one country to another over the course of the last fifty years of the twentieth century. Virtually completed in many European countries, this transition worried many researchers who, between 1950 and 2000, were moved by the demographic slowdown in the West. They called it "demographic crash" (Schooyans professor emeritus of the University of Louvain La Neuve Belgium) and "demographic winter" (expression of Gérard François Dumont professor at the Sorbonne Paris). Alfred Sauvy also emphasized (drew attention to, point out) this danger and Mr. Michel Rocard has even reported as a "demographic suicide" of the West in the closing speech of his(meeting, lecture, summit) conference called "families" held on 01.20.1989 where he stated that "most Western European states are committing suicide, demographic suicide, unknowingly. We must recognize that in many European countries the birth rate has dropped (down) below the

Those countries' population survived or eventually increased solely by immigration. This has become a concern for many governments (Italy Germany Russia, Sweden Spain etc. ...) in 1950, among the 21 most worlds populated countries and consisting of 75% of the global population, there were two African countries, Nigeria in West Africa and Egypt in North Africa, two Latin American countries USA, eight Asian countries and eight European countries. In 2000, of the 24 most populated countries there (were) are four African countries. Besides Egypt and Nigeria, we have Ethiopia in East Africa and the Democratic Republic of Congo in Central Africa, eleven