The British originally used US SUPPLIED destroyers...as the war progressed, the US Navy protected the British (with their help) across the Atlantic; with US Navy DE's (Destroyer Escorts) & CVE's (Escort Carriers also known as Jeep Carriers).
When the word or words CVE or Aircraft Carrier(s) are used; that translates into AIRPLANES. Another words airpower was also used to protect the British while crossing the Atlantic Ocean.
Ans 2
The ALLIED convoys were escorted mainly by Royal Canadian Navy ships and patrolled over by Royal Air Force Coastal Command aircraft from Britain and USAF aircraft operating from Canada and Greenland.
Read more: What_were_some_major_submarine_battles_in_world_war_one
They were at war with each other.
Likely Churchill.
To protect Russian and british ,from German u-boats, while they carried supplies on merchant ships.
German submarines sank an enormous amount of British and Commonwealth shipping in the Atlantic and for a time in 1916 food stocks in Britain were down to about six weeks' supply. German submarines aslo sank some neutral ships and by sinking American ships they brought the U.S. into the war.
Because Roosevelt could not protect british cargo ships b/c US was technically neutral so he declared the entire western hemisphere neutral for he could reveal the location of German submarines to the British
food to the central power
War material.
'42-'44
In the World War One era, it was vital for cargo ships to cross the Atlantic Ocean for the transport of supplies from the USA to Western Europe. The major danger in this was that German submarines were able to use torpedoes to sink ships, both military and merchant vessels. The ship sailing formation called a convoy was designed to protect ships in the convoy and to destroy German submarines.
The operation to protect American merchant ships in the Atlantic before the US entered the war was called the Neutrality Patrol. It involved escorting and protecting merchant ships from attacks by German submarines.
'42 thru '44.
To stop supplies from reaching England