The Suffrages have also been known as the Lesser Litany or the Preces & Responses. The seven pairs in our Prayer Book are adapted from Psalms 85:7, 20:9, 132:9, 28:10, Leviticus 26:6, Psalms 9:18, and 51:10-11. Thanks to the many choir settings for Choral Evensong, the English Suffrages are very well known. But there have been changes in the American Prayer Books. The first in 1790 reduced these only to the first and last pairs. By 1928 all the original six were restored in Evening Prayer. The suffrage “save the King/Queen” was rendered “save the State.” The 1979 Book brought them to Mornign Prayer as well as Evening, substantially edited the translation of some, and inserted the suffrage for the the needy. Our edition retains the addition of 1979 and has a mix of old- and new-style translations of the original six.
I’ve got a lot more detail here: https://saint-aelfric-customary.org/2019/02/20/the-suffrage-in-the-daily-office/
Short responsory prayers like these (and like the Great Litany) were not favored by the radical reformers. They argued that prayers should have longer phrases and sentences; whole psalms are more appropriate than recombined clusters of individual verses like these. And yet, some of these litanies and suffrages have survived. There is a time for longer expressions of prayer and intercession – the Psalms Appointed for Daily Morning and Evening Prayer give us opportunity to pray those in their entirety throughout the month, and the Prayers of the People in the Communion service contain prose prayers based on scripture of more substantial length than these Suffrages. But, just as the worshiper is free to use extemporaneous prayer in private and non-biblical yet biblically-inspired prayers in the liturgy, so too is the worshiper free to use biblically-sampled prayers like the Suffrages.
These are, in a way, like the Prayers of the People in miniature. We pray for mercy and salvation, for our earthly governors and church ministers, for all Christians, for peace, the needy, and for sanctification. The full “Great” Litany is traditionally prayed three times a week, so this “Lesser Litany” can indeed be considered its simplified form for daily use.