× The people in this country is very different.
√ The people in this country are very different.
People is a plural word; it is the plural form of person: one person, two people, three people, etc: ‘How many people were at the party?’
× The people in this country is very different.
√ The people in this country are very different.
People is a plural word; it is the plural form of person: one person, two people, three people, etc: ‘How many people were at the party?’