WI Venice and Florence have and keep power

What if Venice remained a trading super power with a monopoly on spices from the east and salt and Florence has a strangle hold on the trade and production of silk and wool as well has being the center of European banking. As well as this, could Venice take control of northern Italy and Florence taking central Italy. Now I know this is making them a little over power but could they do any of this and what would happen to norther Europe.
 
This isn't a "what if": you're positing a scenario without enough details to make any significant conclusions. You have no explanation of why, how, or even when the Italian states achieve this high status, and without that, we can't answer your question.
 
Right. There needs to be some analysis to flesh these things out. I would love a timeline that posits wealthy and independent Italian city states in the present day commissioning cathedrals and palaces from Calatrava and Norman Foster. But the problem here is not just that in these conclusory propositions you're not really analyzing how these changes in the Italian city states occurred, it's that you're presupposing these are the only ways they could have maintained their power and independence. Thinking a bit about why Florence and Venice lost their power might lead you into areas other than those you list where they could develop new competencies to replace the old ones.

Especially with respect to something like the silk industry, remember that every bit of profit an exporter like Florence can squeeze out of its dominance of the silk market in the short term contributes longterm to the rationale for other states to develop their own silk industries. So some of these situations are not self-sustaining.

This isn't a "what if": you're positing a scenario without enough details to make any significant conclusions. You have no explanation of why, how, or even when the Italian states achieve this high status, and without that, we can't answer your question.
 
OK, I will look things over and correct my mistakes. Sorry this is the first time I have ever done one of the WI post.
 
OK let me try now. What if Venice never sent ships to the Constantinople to defend it against the Turks, which lead to war with them and the lost of most of Venice's eastern Mediterranean holdings, and gain some caribbean and Asian colonies.

What if Ferdinando I de' Medici is put on the throne and not his brother Francesco I de' Medici, so Tuscany does not become basically a vassal of Austria and another one of Ferdinando son takes his places on the throne after his death.
 
As well as this, could Venice take control of northern Italy and Florence taking central Italy
If you want a Tripartite Italy South Naples, Central/West Tuscany, North/East Venice, You step back a couple Hundred Years and go with a Pisian Tuscany.
pre 1280 Pisa controlled Corsica and Sardinia, and was the Predominate City in Tuscany.
 
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