No, a highway is not a symbol of fascism. But using eminent domain to build it is a violation of property rights and I wouldn't have supported it. It is worth noting, however, that the national highway system was supported by a broad consensus - not a mere 51%. The border wall is not.
Your ignorance about the US Constitution is sad and pathetic.
Here, for your reluctant edification is the Fifth Amendment of our Constitution.
The amendment as proposed by Congress in 1789 reads as follows:
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offence to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.