Final answer:
The truth of the statement regarding Cambria City's religious institutions cannot be confirmed without historical context. Plausibility is supported by patterns of immigrants establishing churches aligned with their culture and heritage.
Step-by-step explanation:
Without specific historical context or reference to Cambria City's demographics and time period, the assertion that Cambria City's immigrant population supported seven different Catholic churches and three different Orthodox churches cannot be verified as true or false. Historical questions about the number of churches supported in a specific city by its immigrant population typically require historical evidence or documentation. During periods of significant immigration to American cities, it was common for immigrants to establish places of worship reflecting their religious and ethnic backgrounds. Therefore, it is certainly plausible that a city with a substantial immigrant population could have multiple Catholic and Orthodox churches.