Peter Mathias in an attempt to find out

Peter Mathias in an attempt
to find out how and why numbers rose he points out that after mid 18th
century fertility had twice the effect of falling mortality. The average age of
people marrying for the first time fell, as did the numbers of people never
marrying, which meant more opportunity for babies, and more babies. British
people had previously had a relatively late age of marriage compared to the
continent, and a large number of people never did at all. Nuptuality, overall
health improvements and a better diet from improved food production and higher
wages resulted in better health of mothers and the curtailment of deaths of
women in the reproductive age groups induced higher birth rates. Economical and
social conditions influenced marriage patterns. The expansion of employment in
manufacturing and trading regions offered higher wages, allowing people to
comfortably start families, and as they moved to the industrial centres, they
were likely to meet more, and that increased the chances of matches, and
settling down

the last 60 years the world experienced the most intensive expansion in urban
populations in many Less Developed Countries. People across rural regions of
Asia and Latin America flocked to cities where they transformed the ecology and
culture of modest-sized cities, establishing bustling and sprawling urban
centres that later became beacons for rural migrants. * Over the last decades
improved health care services, mass-immunization programs, access to cheap
medicines, and diffusion of basic knowledge about personal hygiene and sexually
transmitted diseases led to sharp reduction in mortality. Those interventions
reduced infectious and parasitic diseases that used to thrive in densely
populated urban settlements in the past and determined to a large amount urban
population growth. *

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The understanding of the
level of urbanization or its scale in developing countries is challenged by
differences in the definition of urban and in turn, the lack of reliable data.
Furthermore, the process of urbanization is far from homogenous across regions
and swathes of territory that are wholly different in terms of economy and
political structures. Regarding Britain in 19th century, where less mortality
was once the favoured explanation for population growth, it is generally held
to be the increase in marriage and birth rate which caused the explosion. In
contrast and in my personal belief, although high birth rates make the natural
increase of the population an important source of city growth in developing
countries, the movement of people from rural to urban areas within the country
(internal migration) is the most significant factor contributed to urban growth