It identifies as a social democratic party .
The SLPP dominated Sierra Leone 's politics from its foundation in 1951 to 1967 , when it lost the 1967 parliamentary election to the APC , led by Siaka Stevens .
SLPP identifies as a social democratic party .
The SLPP dominated Sierra Leone 's politics from its foundation in 1951 to 1967 , when it lost the 1967 parliamentary election to the APC , led by Siaka Stevens .