Final answer:
The United States was the first country to recognize Israel as an independent nation on May 14, 1948, marking the beginning of international recognition for Israel and leading to the Arab-Israeli War due to regional tensions.
Step-by-step explanation:
The recognition of Israel as an independent nation began almost immediately after its declaration of independence. The United States was the first country to extend diplomatic recognition to Israel on May 14, 1948, the day the British Mandate over Palestine expired. This recognition marked the start of a new geopolitical era in the Middle East. Despite America's diplomatic support, Israel's creation spurred immediate tension and resulted in the outbreak of the Arab-Israeli War as hostile states surrounding Israel, dissatisfied with the establishment of a Jewish state in the region, attacked.