What was the sole purpose of why the u. s. joined world wars

The United state was always ready for any outcome but not until 1916 went a French boat was sinked which was unarmed, but the primary purpose of united state to join the world was the German resumption of submarine attacks on passenger and merchant ships in 1917 made president Wilson decides to lead the United state into world war.

Explanation:

"the sepoy rebellion was the result of many, many influences and stressors on the cultures of india living under british rule. in britain, it's called the sepoy mutiny on the indian mutiny, but in india, it's called the first war of independence.

the main reason is concerned to the british paramountcy , the belief in british   dominance in india political, economic and cultural life had been introduced in india about 1820."

"they were forced to grow crops that benefited the colonizing nations instead of feeding their own people."

depending on what kind of map for example a pltical maps works in many ways this iss how it works it shows the areas and places the democratics and the repbulcicans reside for example if   texas chooses trump for president there a republican state and if   califronia chooses hillary there a democratic state.