Not exactly...
What you are thinking of is the sinking of the RMS Lusitania, an English passenger line that went from Liverpool, England, to New York City and back again. It was sunk by a German U-Boat roughly a hundred miles the coast of Ireland, as it was headed towards Liverpool (ergo, full of New York passengers). This got the US quite upset.
On top of that, the English strategically timed the release of a dispatch from Germany to Mexico that they had decoded, this was called the Zimmerman Telegram. In the telegram, Germany promised Mexico that if they joined the Central Powers and the Central Powers won, then Mexico would regain all the land lost to America in the Spanish-American War.
It was primarily that combination that caused America to enter the war.
use of submarines
Yes Germany did use tanks during world war 1, they use tanks alone with airplanes, gas masks, and submarines
Germany was first to use submarines in World War 1 knwn as " U- 2 ". Later on UK and USA produced their own version. - b sharma.
It sounds as if you are looking for submarines.
sink allied supply ships to England
Britain blockaded Germany during World War 1, preventing food and materials from reaching the country. The Germans hoped to break the blockade by deploying submarines that would destroy British maritime power. Also, the submarines attacked cargo ships that brought supplies to Britain. In this way, Germany attempted to blockade Britain through the use of submarines. Also, submarines crushed British morale and made the war unpopular in the eyes of the public.
The Germans were the first to use Submarines in World War 1. Now i believe that the marines now do at times.
The early SS and the newer GATO Class diesel submarines.
America never joined/allied with Germany in World War I and II. America was an ally and Germany was an axis. But America did join partially because of Germany. Germany announced that they would use their submarines on anyone and America felt threatened and decided they needed to take action. Germany also contacted Mexico and asked Mexico to help Germany defeat America.
. Submarines
Sometimes they used torpedoes launched from submarines.
The Germans have used submarines in the Atlantic at various times in the past, including today. Atlantic submarine activity was a key theater of both World War I and World War II.