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 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.
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.
Disease brought over by explorers
Elephant seals experienced a dramatic decline in population primarily due to extensive hunting in the 19th century for their blubber, which was used for oil. Additionally, habitat loss and environmental changes contributed to their decline. By the early 20th century, they were nearly extinct, but conservation efforts and legal protections have since allowed their numbers to recover significantly. Today, they are primarily found along the coasts of California and the North Pacific.
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.
Economis decline is what caused the naval superiority to decline then
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 steady decline of the black-footed ferret population in Wyoming was primarily caused by habitat loss, disease, and the decline of their main prey, the prairie dog. The spread of sylvatic plague significantly impacted prairie dog colonies, leading to a reduction in food sources for the ferrets. Additionally, habitat destruction due to agriculture and urban development further exacerbated their decline. Conservation efforts have since been implemented to help recover the population.