The Assyrian homeland or Assyria refers to a geographic and cultural region situated in Northern Mesopotamia that has been traditionally inhabited by Assyrian people. The areas that form the Assyrian homeland are parts of present-day northern Iraq, southeastern Turkey, northwestern Iran and, more recently, northeastern Syria. Moreover, the area that had the greatest concentration of Assyrians in the world until recently, is located in the Assyrian Triangle, a region which comprises the Nineveh plains, southern Hakkari and the Barwari regions. This is where some Assyrian groups seek to create an independent nation state.

During World War I the Assyrians suffered the Assyrian Genocide which reduced their numbers by up to two thirds. Subsequent to this, they entered the war on the side of the British and Russians. After World War I, the Assyrian homeland was divided between the British Mandate of Mesopotamia, which would become the Kingdom of Iraq in 1932, and the French Mandate of Syria which would become the Syrian Arab Republic in 1944.  Assyrians faced reprisals under the Hashemite monarchy for co-operating with the British during the years after World War I, and many fled to the West. The Patriarch Mar Eshai Shimun XXIII, though born into the line of Patriarchs at Qochanis, was educated in Britain. For a time he sought a homeland for the Assyrians in Iraq but was forced to take refuge in Cyprus in 1933, later moving to Chicago, Illinois, and finally settling near San Francisco, California.  The Assyrian Chaldean Christian community was less numerous and vociferous at the time of the British Mandate of Mesopotamia, and did not play a major role in the British rule of the country. However, with the exodus of Assyrian Church of the East members, the Chaldean Catholic Church became the largest non-Muslim religious denomination in Iraq, and some Assyrian Catholics later rose to power in the Ba'ath Party government, the most prominent being Deputy Prime Minister Tariq Aziz. The Assyrians of Dohuk boast one of the largest churches in the region named the Mar Marsi Cathedral, and is the center of an Eparchy. Tens of thousands of Yazidi and Assyrian Christian refugees live in the city as well due to the ISIS invasion of Iraq in 2014 and the subsequent Fall of Mosul  In addition to the Assyrian population, an Aramaic speaking Jewish population existed in the region for thousands of years, living mainly in Barwari, Zakho and Alqosh. However, All of the Barwari Jews either left or were exiled to Israel shortly after its independence in 1947. The region was heavily affected by the Kurdish uprisings during the 1950s and 60s and was largely depopulated during the Al-Anfal campaign in the 1980s, although some of its population later returned and their homes were subsequently rebuilt. Assur, which is in the Saladin Governorate, was put on UNESCO's List of World Heritage in danger in 2003, at which time the site was threatened by a looming large-scale dam project that would have submerged the ancient archaeological site. Answer this question using a quote from the following article:

What modern countries are a part of the modern-day Assyria?
the Kingdom of Iraq in 1932, and the French Mandate of Syria which would become the Syrian Arab Republic in 1944.