Judicial review is where they determine if a law is unconstitutional or not. this affected the role of the supreme court because the judicial branch aka supreme court reviews the actions of the executive and legislative branches
Hello. You did not post the announcements that the question refers to, but I can help you, since the announcements that reflected European views at the time of imperialism, generally displayed obvious ideas about the purity and superiority of the white man and the idea that colonies are dirty places without civilization.
The idea of purity and superiority is related to the idea of the "white man's burden", which was a concept that stated that it was a duty (given by God) to Europeans to "clean up", take Christianity and dominate regions with inferior people , in this case, non-white people who lived in other countries, who were considered unclean and therefore needed to be purified by whites.
In this way, Europeans used a strong racist bias to dominate and enslave peoples of other ethnicities, promoting imperialism while claiming that this was the role that God had assigned to whites in this world.
Their thoughts can't be hundred percent sure without the diaries but they had thoughts on how much hardship they would have to go through the trip across mountains and rocky paths, they also had to survive with minimal resources, so their thoughts on this was probably brave and rough trip, they had no clue if they were gonna survive or what was gonna happen, they territory was unknown.
It is very emotional and inspiring