In contemporary English, the phrase 'at one remove' simply means 'one step away from.' The phrase is typically used to denote conceptual rather than physical distance, but at times both are implicated; for example, when speaking of the historian whose account of an ancient historical event is 'at one remove' from an ancient account of the same event.
English Is a very diverse language, it's base is Germanic but has gradually changed over the century's. The most influential changes were brought about by the Roman's who Invaded Britain as well as the french, who took control over the country with the the victory at Hastings in 1066. English also has word's stemming from Norse, Arabic, and Greek.
led (or lead, pronounced leed in this context) or guided, as led and guided are very similar words.
The word picnic is derived from the French word "pique nique" to describe an outdoor meal. The earliest versions of picnics come from the Middle Ages when members of the upper class would "dine out" during a hunt. The first record of the word "pique nique" comes from the 1692 edition of Origines de la Langue Française de Ménage.
According to the Oxford English Dictionary, the first recorded use of "picnic" in English appears in 1748 in a letter from Lord Chesterfield to his son residing in Berlin, in the sense of a social gathering. 'Picknicken' in German means to hold a meeting. A subsequent mention occurs in a letter from Lady M. Coke to Lady Stafford in 1763. A 1738 translation of Lord Chesterfield's letter into Swedish used "picnick" and the Swedish dictionary suggests it is of French or English origin. By the early 1800s "picnic" was used only in the sense of a social meal eaten outdoors.
It has nothing to do with slavery. That is an urban legend.
The word hippopotomonstrosesquippedaliophobia may be the hardest to spell.
(It is the fear of long words.)
Also see the related question.