An article from late 2020 in the Italian Navy magazine Rivista Marittima, references a plan by the English to divide up Italy after WWII. The scheme was reportedly presented at the Tehran Conference in November 1943, where Roosevelt, Churchill and Stalin met for the first time to coordinate several aspects of post-war planning, including the future of Italy, which had surrendered a few months earlier.
As can be seen from the map above, Italy wouldn’t have just gone to the English, but rather to a slew of countries, under an AMGOT (Allied Military Government of Occupied Territories). Here's a breakdown of the countries and the areas they would control:
Yugoslavia (Istria and the Veneto region)
France (Milan, Piedmont, Liguria, and Valle d'Aosta)
UK (Sardinia, Sicily, and part of Calabria)
Greece (southern Italy)
US & the Pope (central regions from Emilia to Naples)
Austria (South Tyrol)
Roosevelt and Stalin both reportedly rejected the idea of partitioning Italy. But if one chooses to believe that the proposal did, in fact, happen, it doesn’t mean that Italy only exists today due to the American and Soviet veto of the British bid. Rather, it’s that an AMGOT is applied temporarily, not permanently. Furthermore, such a system - in which the French controlled the proposed areas and the US and Britian controlled the rest - was in place after the war. It was only in the years between 1945 and 1947 that Italy regained control of their country and became a republic.
Notes: The few instances where this proposal was mentioned online, in Italian, it was met with incredulity by readers, who often called it a “stronzate” (ie, BS). The facts show that the partition of certain European countries did occur in WWII, and the article from the Italian Navy magazine is properly sourced, yet I can find no documents in English or Italian to confirm the English proposal.