What was the major cause for the entry of the u. s.into world war one

Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation for Wilson's decision to lead the U.S into WWI. Following the sinking of unarmed French boat the Sussex.

The major cause for the entry of the United States into World War I was  the event known as the sinking of the Lusitania ship, which started an anti german feeling within the american public. This was followed by the sinking of several American ships,  which led the Congress to declare war on Germany on April 6, 1917.

the answer to this question is the third option. hope this

from the religious point of view, the conflicts began because of the enmity between catholic and protestants. in 1649, at the insistence of baltimore, the colonial assembly approved the act of religious tolerance, the first law in the colonies granting freedom of worship, though only for christians. in 1654, however, with the protestants of maryland in the majority, the act was revoked. the almost civil war broke out and order was not restored until 1658, when lord baltimore was returned to power.

on the issue of class conflict, the chesapeake region offered few economic opportunities to contract employees who had served their term of obligation. even with the small amount of capital needed to grow tobacco, former hired servants at best became subsistence farmers, a mature class for those called to rebellion, such as those proposed by nathaniel bacon. as the number of new hired workers declined because of limited chances of progress and reports of severe treatment, they were replaced by african slaves.

from the racial point of view, after 1660, the chesapeake colonies imposed laws that defined slavery as a lifelong and hereditary condition based on race. this made slaves profitable because planters could rely not only on their work but also on their children. the slave population, which numbered four thousand in virginia and maryland in 1675, grew significantly by the end of the century.