No, ww2 lead to the US becoming a world power.

USA was a regional power with little need and desire for a military that could project power far outside her borders. 1890, the US blue-water navy consisted of three armoured cruisers Is is not until Theodore Roosevelt's Great White Fleet sailed arond the world with 16 battleships and escorts 1907 that the US had a navy capable to project power in the Pacific and the Atlantuc and contend control of the seas with a grand power (except Britain). The war with Spain was against a fourth or fifth rate power and while the first US victory against a European power, not really indicative of the US ability to bring war to the enemy - Cuba was a lot closer to the US than to Spain, and the Phillipines were already in full revolt.

The US was a regional power, capable of taking on any country down to Panama (with the exception of British Canada) until 1897, when it proved itself capable of taking on a fourth rate power such as Spain.

World war one saw the birth fo the US as a grand power, even if US industry proved unable to provide its troops with arms and ammunition in France. The US troops in France fought with French planes, artillery and tanks and British machineguns, while much of the supply and logistics were provided by the British.

USA emerged as a grand power, especially financially and industrially after ww1, but preferred to not exert this power. Rather, it closed itself in isolationism, leaving the Legue of Nations and limiting itself to enforcing the Monroe doctrine and leaving the rest of the world to it.

Ww2 saw USA emerge as a superpower that was willing to use both its soft and hard power to influence the world.

Well there was already things like Commodore Perry's trip to Japan and the USA's involvement in the Boxer Rebellion, they were hardly uninvolved in the world before.

You may want to read this http://www.reddit.com/r/AskHistorians/comments/1u494r/did_the_spanish_american_war_help_bring_the_us_to/