Answer
Europe
Explanation:
In 1900, Europe had more steel-producing countries than other continents. This is because Europe was leading the Industrial Revolution and had more factories and industries than any other part of the world. Steel was necessary to build those factories and industries. therefore, it's Europe.
A series of events led to the attack on Pearl Harbor. ... (The day after the Pearl Harbor attack, the Japanese indeed launched their invasion of the Philippines). Planning for the attack on Pearl Harbor had begun in very early 1941, by Admiral Isoroku Yamamoto.