Question

Which of these was a factor in the u.s. entry in world war 1

Answer 1

You didn't list any factors, but there were many.

For instance, the USA entered World War I because Germany had sunk a ship with US passengers, the Lusitania, after an agreement that neither would attack in the sea warzone.

Another factor that caused the USA to enter World War I was the Zimmerman Telegram, Germany sent a coded telegram to Mexico in hopes of getting Mexico to ally with them and turn against the USA.

Hope this helps!