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The past tense of balance is balanced.
Leaders tried to keep a balance of power in Europe.
Conservative leaders eliminated many past changes made by liberals.Leaders redrew the map of Europe.Leaders tried to keep a balance of power in Europe.
The past tense is balanced.
The past participle is balanced.
Thing of the Past was created in 2007.
At the present time no country is "threatening nuclear war". A balance of power has existed for the past 60 some years.
The word "thing" is a noun and so doesn't have a past tense. Only verbs have past tenses.
The past tense of power is powered.
The past tense of overdrawn is overdrew. As in "he overdrew his bank balance".
"Thing" is a noun and so doesn't have a past participle. Only verbs have tenses.
Answer Your question is a bit out of date. A balance of money has nothing to do with what happened in a past society, it's what happens to that money now that counts.