Only some of the Indians joined with the french, first of all. Secondly, They joined the French because the French did not try to steal their land, and they traded with eachother, to put it simply.
If nations are going to pick sides in a war, it's normally for two reasons: They have something against one side and/or have something to gain. In the case of the American Revolution, both sides stood to profit from the war.
In France, a key factor was Enlightenment which was sweeping through Europe. Upon the signing of the Declaration of Independence in the colonies, the educated French class embraced it as a manifestation of the Enlightened spirit. Still, they were skeptical about aiding the Americans. It took some persuasion from Benjamin Franklin (who was very popular with the French courts) and the victory at the Battle of Saratoga to gain French support for the cause. Convincing the French that the Revolution was a way to defeat England, the French jumped on board and allied with us.
Spain's involvement in the Revolution can be attributed to one thing: Their alliance with France and their strong dislike for the English. The Spanish really had nothing to gain and had little interest in joining the war, if anything, the French drew the Spanish into the war by resorting to the Bourbon Family Compact (1713) which basically says that France and Spain were allies and had to help each other out when they needed it.
As for WWI, France and Spain did not enter WWI on the side of the Americans-- The Americans entered WWI on the side of the Allied Entente powers which included France. The US entered WWI because of unrestricted submarine warfare and the Zimmerman note. Spain was neutral in WWI and did not have any sides. The same is true for WWII.
France and Spain or their predecessors have gone to war against each other and with each other against other enemies numerous times throughout history. Each of these times, the war was started for different reasons and had different aims. Some such wars included the Thirty Years War (opposed), the War of Spanish Succession (together), the Seven Years War (opposed), the Napoleonic Wars (opposed), etc.
If you are specifically thinking about the French Revolution and the Napoleonic Wars, there were three reasons:
1...Like revolutionaries in other times, they had a message. They wanted to spread the revolutionary gospel, and military takeover was the quickest way to do it.
2...They were afraid that they would be invaded by antirepublican European powers. Notably, they were scared that the murder of Marie Antoinette would provoke retaliation by her family, who of course ruled Austria. They wanted to get their retaliation in first.
3...France was not united. The revolution initially succeeded only in Paris and one or two other conurbations; a majority of the population remained Catholic and Royalist. In addition, government finances were catastrophic (and had been for centuries) - they did not even know how much they owed, had, or raised in taxes. People who had been expecting a tax reduction found they had to pay more. The Republic was insecure. One of the best ways to unite a disunited community is to have a foreign war - men will rally round to defend their country even when they disagree with the government. One can also hope to solve the budget problem by looting conquered countries. Hence Republican and Napoleonic France, for both financial and solidarity reasons, continued an aggressive policy of foreign adventure.
To gain more power
No
spain
No
no, only France and grate Britain
yes, Indians in Maryland went to the French and Indian War including the tribes Nanticokes, Choptanks, Pocomokes, and Wicomicos.
The French and Indian War was between the British and the French. Spain was not a participant. It recieved New Orleans from the French because of the Wars of the Austrian Succession.
No, however Spain was invovled in the Wars of the Austrian Succession, which was the series of wars of which the French and Indian war was one.
spain
The British had the strongest navy during the French and Indian War
Spain, french, and Britain
He joined the war in 1756.
Spain
Louisiana
Spain
The French lost all claims in North America.
Spain in the French and Indian War.
Spain(:
No