Jutland ...

Some think Jutland assured British sea domination.

I'm not so sure. It was only part of sea fighting.

The following, showing Allied tonnage lost to German U-Boats in WWI. This is not British domination of the sea.

Via Wikipedia:

Allied and Neutral Tonnage sunk by submarines in World War I

Month	1914	1915	1916	1917	1918
January		47,981	81,259	368,521	306,658
February		59,921	117,547	540,006	318,957
March		80,775	167,097	593,841	342,597
April		55,725	191,667	881,027	278,719
May		120,058	129,175	596,629	295,520
June		131,428	108,851	687,507	255,587
July		109,640	118,215	557,988	260,967
August	62,767	185,866	162,744	511,730	283,815
September	98,378	151,884	230,460	351,748	187,881
October	87,917	88,534	353,660	458,558	118,559
November	19,413	153,043	311,508	289,212	17,682
December	44,197	123,141	355,139	399,212
Total	312,672	1,307,996	2,327,326	6,235,878	2,666,942

Grand Total 12,850,815 gross tons

1917:

In April, US Rear Admiral William Sims arrived in London as US Naval Liaison. He was dismayed to be informed by the Admiralty that Germany would win the war if its submarines went unchecked, and cabled Washington to have USN destroyers despatched to Queenstown, Ireland, from where they were to patrol to the west.

Had America not come into the war, Britain would have starved.

.