WI:Columbus turns back?

In honor of Columbus Day (sorry if this has already been discussed). What if Columbus' crew mutinies before they reach the New World, and they turn back? What effects does this have on the age of discovery? Spain? and how long before other nations travel westward or eastward to the Americas? Also how long does this block European expansion to N. and S. America?
 
The Portuguese discover America a few years later. Spain will probably jump on the bandwagon, but will be unlikely to receive as large of a share of the America's as in OTL whereas there are likely to be numerous Portuguese colonizes outside of Brazil. Colonization continues at more or less the same rate given the disestablishing effects of small pox on the native american empires.
 
Portuguese ships will be swinging farther and farther out into the Atlantic, and they will eventually run into Brazil. However, it'll be fairly uninteresting--the people sailing there are going to be planning to go to the Orient, with a whole bunch more valuable stuff. Brazil might even be kept a secret for some years (there's evidence this happened IOTL). European diseases will diffuse through the Americas, but slowly--they might reach Mexico and Peru only just before some European decides to sail along the Brazilian coast to the Caribbean. That would probably be forty or fifty years, I guess.
 
If there is a Mutiny, I doubt if Columbus will be alive to try in 1493.

However remembre Coumbus did not just sail off into the Ouknown hoping that there would be something out there.

Columbus married the Daughter of a Well Known and Respected Portuguese Navigator, and as her Dowry, she brought along His Journals as well as the Journals of many of her Relatives.
Many of these Journals described Voyages between the Canary, Cape Verde, Azores and Madrid Islands.
Some of these had accounts of Ships blown far to the west by Storms, and the recording of what they found.
From these accounts of the Sighting of Sea & Land Birds, along with other indications, Columbus [as well as other Navigators] KNEW there was land out there, and He expected it to be more Azores type Islands.
As such his arrival at the Bahama Islands meet his expectations.

However the Common Seamen Hadn't read the Journals.
Even if Columbus's Ships had turned back. Another Navigator would have followed The reports in the Journals.
 
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