I wonder whether western people are harder to communicate with strangers than Asia people? Sometimes I find that a person from western countries is not so easy-going while in the same time an Asia person is more outgoing and warmhearted.Do all western people are like this or it is just because of culture?

When can we use a comma between a sentence and a preposition like "and""or"so on? Sometimes a passage might say,"He likes dogs,and he wants to keep one.",or "He likes cats and he wants to keep one."So which sentence is correct?