An ethnic group is a group of people who subjectively identify themselves and distinguish themselves from other groups in the larger social and cultural system because they objectively have a common source and a common culture extending from it. The common source refers to the lineage, Lineage, physical similarity; common culture refers to similar languages, religions, customs, etc. According to the above definitions, which of the following belong to the ethnic group? ['To meet the enthusiasm and needs of students to learn calligraphy, a calligraphy society was established in the university.', 'Because they share the same religious beliefs, Islamists around the world have come together to form a large religious group. According to statistics, as of 2009, there are currently 1.57 billion Muslim Muslims.', 'Most Asians in the United States are new immigrants in recent decades. Asian Americans have become one of the most successful ethnic minorities in the United States because of their traditions of hard work, frugality, hard work, and education.', 'Due to increased work pressure, the cost of childbearing and raising children has increased year by year. Some young people have fixed income and fertility, but choose not to have children.']