Also , a combination Cause_to_amalgamate of ethnic gangs and police neglect strained Causation the racial relationships .

In the latter stages of the combined Cause_to_amalgamate Eighty and Thirty Years ' wars Hostile_encounter that had greatly strained Spanish resources , Breda was lost Earnings_and_losses to the Dutch under Frederick Henry after a four-month siege .

The coup Change_of_leadership further strained Cause_change_of_strength Polish–Lithuanian relations .