How were the Japanese able to surprise the US at Pearl Harbor?

Japanese aircraft carriers had approached Hawaii unnoticed.

As a result of Japan’s attack on pearl Harbor thousands of American died and the Us declared war on Japan.  

The surprise attack of Japan at Pearl Harbor in Hawaii on December 7th, 1941 had killed many Americans and destroyed American ships and Airplanes along with USS Arizona, the crown of US Navy.  

However, Americans have no intention in joining the Allied forces in the World War II, the drastic incident at the Pearl Harbor made them to join the war. American president FDR declared war on Japan. This made the Germany to declare war on America. The triangular declaration of war made the Americans to involve in the World War II, completely.

angel island immigration station was an immigration station located in san francisco bay which operated from january 21, 1910 to november 5, 1940,[4] where immigrants entering the united states were detained and interrogated. angel island is an island in san francisco bay. it is currently a state park administered by california state parks and a california historical landmark. the island was originally a fishing and hunting site for coastal miwok indians, then it was a haven for spanish explorer juan manuel de ayala. later, it was developed as a cattle ranch, then, starting with the civil war, the island served as a u.s. army post. during the island's immigration station period, the island held hundreds of thousands of immigrants, the majority from china, japan, india, mexico and the philippines. the detention facility was considered ideal because of its isolated location, making it very easy to control immigrants, contain outbreaks of disease, and enforce the new immigration laws.[5] the station is listed on the national register of historic places under the title angel island, u.s. immigration station, and is a national historic landmark. the station is open to the public as a museum – "a place for reflection and discovery of our shared history as a nation of immigrants”.

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the titanic was filmed in canada and si my fav