What event forced Japan to open its doors to the outside world the invasion of the Chinese the flood of foreigners the arrival of Commodore Matthew Perry the eruption of Mt. Fuji?

The event that forced Japan to open its doors to the outside world was the arrival of Commodore Matthew Perry in 1853. His expedition, which included a show of military strength and modern naval technology, compelled Japan to sign the Treaty of Kanagawa in 1854, ending over two centuries of self-imposed isolation. This marked the beginning of Japan's engagement with Western nations and significant changes in its political and social structure.