I think that because of the disease and bad living conditions killed many of the Africans and Europeans. The Africans had a very high mortality rate and disease was spread quickly because there was no room in the ships so there could be one infected person on the ships and everyone he was next to for the trip (about 5-7 months) could catch it and the person next to the newly infected person could catch it, etc. About 15% of the Africans died on the ships coming to the New World.
The decline in the Amerindians population in the 16th and 17th century was primarily caused by the introduction of new diseases brought by European colonizers, such as smallpox, measles, and influenza, to which Amerindians had no immunity. This resulted in large-scale epidemics that decimated their population. Additionally, violent conflicts, forced labor, and displacement from their land played a role in the decline.
The Bubonic Plague (a.k.a The Black Plague) caused a dramatic decline in the population of Europe in the 1300s.
Diseases introduced by the Columbian Exchange
Diseases brought from Europe for which they had no immunity.
Poverty, war, and famine caused the cities to grow in population at the end of the nineteenth century.
The population of Summerfield Florida in 2002 is 19,410. Where as in 2010 it was reported that the population had declined to 14,487. The factors are unknown as to what caused the decline.
Disease brought over by explorers
Economis decline is what caused the naval superiority to decline then
Arrival of Spanish conquistadors during the 16th century. This is known as the "Mexican population collapse" whereas indigenous people died of smallpox and other European-brought diseases, falling from 20-40 million in the 15th century down to just 3-4 million by 1629.
The African skimmer is listed as "Near Threatened", not endangered. The decline in population seems to have been arrested now, and there is some resurgance in population. Habitat loss caused the initial decline.
The decline of the primary sector is caused due to the fact of less raw materials and a growth in population so more goods and services need to the sold. also farm lands are decreasing and industry is increasing.
The development of a merchant class.
there would be to many fish romaing the sea