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In page Sympathy:

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Spatial proximity, or when a person or group exists close geographically (such as neighbors and citizens of a given country), they will more likely experience sympathy towards each other. Similarly, social proximity follows the same pattern. Members of certain groups (ex. racial groups) favor people who are also members of groups similar to their own.[3] Social proximity is intimately linked with in-group and out-group status. In-group status, or a person falling within a certain social group, is also integral to the experience of sympathy. Both of these processes are based on the notion that people within the same group are interconnected and share successes and failures and therefore experience more sympathy towards each other than to out-group members, or social outsiders.